Notes on the cars:

Chevron B20B [72-3] (Bobby Brown): Sold via Fred Opert to Bobby Brown (Hicksville, NY) for SCCA Formula B. Third and first in the two Bogotá races early in 1972, then raced in the JAP GP at Fuji in May. Also won the Pro FB race at Lime Rock in July. Likely to be the B20 raced by Dan Carmichael (Columbus, OH) at the 1972 SCCA Runoffs. Raced by Chip Mead (Dayton, OH) at Mosport Park in July 1973. To Freeman Racing for 1974, and raced by Price Cobb in the Pro Formula Atlantic races that season. Advertised by Cobb in early 1975, then advertised by Richard Jackson (Dallas, TX) in August 1975 as "ex-Brown", and February 1976. Next seen when sold by a dealer, Paul Lindell (Houston, TX), to James Sawyer in January 1978. From Sawyer to Jeff McKay (Tacoma, WA) then on to Walt Pawluczkowycz (Evergreen, CO). Sold by Pawluczkowycz to Steve Marschman (Idaho Falls, Idaho) in May 2004.

Chevron B18 [18.71.1] (Brian Robertson): A new car built for Brian Redman after he wrecked the development B18 while testing in South Africa. Fitted with a 1.8-litre Cosworth FVC engine and raced by Redman in two races in South Africa in January 1971. This car returned to Bolton and became the works entry in F2 for Chris Craft during the 1971 F2 season. It was then sold to Canadian John Powell and rebuilt to Formula B specification. Powell raced it in the Brands Hatch Boxing Day meeting at the end of 1971 and then loaned it to Brian Robertson to race in the two Bogotá FB races in February and March 1972. Raced by Powell (Ottawa, Ontario) in the Canadian FB series in 1972, Sold to Paul Wheatley (Montréal, Quebec) and raced in the Canadian series in 1973. Appeared on a couple of early-1974 entry lists but not seen again.

Chevron B20 [71-1] (Jim Grob): The prototype Chevron B20 was completed in Formula B specification delivered to Jim Grob (Ft Lauderdale, FL) in time for the 1971 Run-Offs. Grob then raced the orange car at the Bogotá races in early 1972 and then in Southeast Div and Pro FB in 1972. He retained the car for 1973 and 1974, racing it in a total of four Run-Offs, before selling it to Peter Symonds (Rowley, MA) for the 1975 season. Symonds only raced it four times: two SCCA Regionals in 1975 and another two in 1976. Symonds advertised it in 1977. Its next owner was Jack Van Dell who raced it in Regionals in 1985. It was sold to Pierre Haverland (Belgium) in 1988 and then to Nelson Todd (Belfast, Northern Ireland) in 2000. To Laurent Fort (Arles, Provence, France) in 2006, then to Michael Henderson (Donaghadee, County Down, Northern Ireland) in 2007.

Brabham BT35 [32] (Raúl Pérez Gama): Raúl Pérez Gama was one of several Mexican customers of Fred Opert racing in the early 1970s. For 1972, he had a brand new orange-and-yellow Brabham BT35 and raced as part of the Fred Opert Racing team in Pro Formula B events with entry number #66. He retained the car for the two Bogotá races in early 1972 after which BT35-32 has been indentified as the car driven in SCCA events by Gordon Strom (Santa Cruz, CA or Sunnyvale, CA) in 1972 and for the following three seasons, retaining the car's original orange and yellow colours throughout. For 1976, Strom acquired a Chevron B29 and the Brabham may have been traded back to Fred Opert.

Brabham BT29 [48] (Thomas E. Kornell): Sold new to Tom Kornell (Seal Beach, CA) and raced in SCCA Divisional and Pro Formula B in 1971 and 1972. Kornell added a sports car nose and a more substantial rollhoop amongst other changes. He ordered a Brabham BT41 for 1973 and the BT29 went to Fred Opert as a trade. Subsequent history unknown.

Lola T240 [HU4] (Syd Demovsky): New to Syd Demovsky (Chicago, IL) and his red #11 Demovsky Racing Lola T240 in the 1971 Pro FB series. Retained for 1972 and again did a full season, still red and still using #11. Subsequent history unknown. A car with this chassis number raced by Bob Juggins in 1996/97.

Lola T240 (Jim Harrell): Jim Harrell (Tecumseh, Michigan) bought an ex-Sarich Lola T240 from Carl Haas after winning the Formula Ford title at the 1971 Runoffs. After having real problems with it in the Bogotá races in February and March 1972, he returned it to Haas in exchange for a new T242. Nothing more is known of the T240.

Brabham BT29 [45] (Doug Brenner): This is one of a pair of late BT29s acquired by California dealer Charlie Hayes which remained unraced during 1970. It was sold it March 1971 to Doug Brenner (Pasadena, CA) and raced in Pro events and in SCCA Nationals that season. Brenner raced the yellow Brabham in the two Bogotá races in early 1972 and then sold it to Phil Palm and Ron Pohl 1972 who retained Brenner's entry number of #26 and raced the car in 1972. They sold it to Bill Summers who raced it in mainly Regional races at Elkhart Lake, Brainerd, and Blackhawk Farms. The next owner was Bob Mijolevic and around this time the car was fitted with a Mazda engine and used in autocross. Mijolevic last raced the car in 1982 but after that the history is largely unknown until it was bought by Cy Moreland (Trainer, PA) who in turn sold it to Dave Burch (Los Altos, CA). Rebuilt in the mid-1990s using a replacement Marc Bahner chassis. Sold in late 2011 to Wayne Wilson (Sydney, Australia)

Brabham BT29 [1] (Ron Dykes): John Angus bought the first BT29, ordering the car as early as late summer of 1968 but taking delivery in August 1969. He ran it in Regionals in late 1969 before participating in the Pro series in 1970. He swapped from a Vegantune to a Racing Services engine for 1971 and continued in Nationals. Angus continued with the car in 1972, when Ron Dykes also drove it in the Bogotá races and again in 1973, when the car continued to be competitive at National level. Unknown after the end of the 1973 season.

Brabham BT29 (Rudolfo Junco): After Rudolfo Junco's wrecked his usual Brabham BT29 in an accident in the warm up session at the FB race at Monterrey, Mexico, in June 1971, he was allocated another BT29 as part of the Fred Opert Racing operation. This #80 car was advertised by Opert later with mention that it was the car driven by Bill Brack at Mosport Park 19 Sep 1971. It was then sold and may be the #80 car owned by Bunny Ribbs and entered by his Bunny Ribbs Plumbing & Heating for Mike Eyerly and Jon Milledge in 1972. If so, it is chassis BT29-38.

Brabham BT35 [9] (Nick Craw): Chassis number given for Nick Craw's car in Autosport report of Arco Trophy race at Castle Combe, April 12, 1971, where the car debuts. [AS 15 Apr 1971 p20] Report says car is being taken over to North America, so presumably the BT35 used by Craw in races there in 1971, entered by Fred Opert.

Sources

The identification of individual cars in these results is based on the material presented elsewhere in this site and may in some cases contradict the organisers' orginal results.

1970 US FB results were compiled from Autoweek reports by Jim Thurman; 1971 results were transcribed from Autoweek by Allen Brown and 1972 results were compiled by Chris Townsend from an SCCA results publication.

The US Formula B series did not continue in 1973 but a race was organised in Caracas in March 1973 that fits here probably better than anywhere else, as do the occasional SCCA F/Atlantic and FB races in 1974 and 1975.

All comments, clarifications, corrections and additions are most welcome. Please email Allen if you can add anything.

Individual sources for this event

An entry list on Fred Stevenson's website (http://www.fredstevensonlotus.com) lists Bob Brown in a Chevron B20B; Fred Opert, Fred Van Buren and Brian Robertson all in B18Bs, Jim Grob in a B20B and Rodolfo Junco in a Brabham BT29. The results sheet on his site does not give model numbers but matches the marques from the entry list.